Method path

cpp/src/arrow/ipc/dictionary.h:44–52

  FieldPosition child(int index) const { return {this, index}; }

  std::vector<int> path() const {
    std::vector<int> path(depth_);
    const FieldPosition* cur = this;
    for (int i = depth_ - 1; i >= 0; --i) {
      path[i] = cur->index_;
      cur = cur->parent_;
    }
    return path;
  }

 protected:
  FieldPosition(const FieldPosition* parent, int index)